i have drilled 2 holes per lamp, one top, one bottom, and the quite frankly ridiculous amount of condensation in my rear lamps is nearly gone. not an ideal solution but at least it is working. wonder if any other lamps on the rear of any make of car does the same thing as badly? i know the headlamp reflectors on the volvo trucks i work on used to go black through a similar problem. lamp was redesigned, but the older ones still do it!!